Gaging and scribing tool



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J. R. TO'PPING. v GAGING AND SORIBING TOOLL No. 565,579. v Patented Aug.11, 1896.

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QAGING AND SGRIBING TOOL.

No. 565,579. Patented Aug. 11, 1896.

IIIIIII UNITED STATES PATENT FFicE.

JAMES R. TOPPING, OF HARTFORD, CONNECTICUT.

GAGING AND SCRIBING TOOL.

SPECIFICATION forming part of Letters Patent No. 565,579, dated August11, 1896.

Application filed July 6, 1894. Serial No. 516,727. (No model.) i

To (tZZ whom it nuw concern:

Be it known that I, JAMES R. TOPPING, a citizen of the United States,residing at Hartford, in the county of Hartford and State ofConnecticut, have invented certain new and useful Improvements in Gagingand Scribing Tools, of which the following is a full, clear, and exactspecification.

This invention is an improved tool for performing many of the ordinaryfunctions of surface gaging and scribing instruments. By its improvedconstruction and arrangement it is alsoadapted to perform other functions not usually within the scope of this kind of a tool.

Figure 1 of the drawings is a side View, and Fig. 2 is a plan View, ofmy improved tool, showing in connection therewith the dot-and dashoutline of a piece of work and illustrating one of the importantfunctions of this tool. Fig. 3 is a plan view in section on the line 3 3of Fig. 1, showing the mode of fastening the vertical standard andillustrating, the

tool, in conjunction with the dot-and-dash circle, in its'capacity as acenter-gage. Fig. 4.- is side view, partly in section, taken on the lineat 4 of Fig. 3. That line and section are taken in the three differentplanes of the bolt, the standard, and the scriber in order to show theirconstruction and relation clearly.

The base 5 of the tool is provided with suitable hubs to receive itsvarious appurtenances and is provided with a V-shaped recess ofsubstantially ninety degrees opening, as shown. The walls of this recessare preferably carried by means of flanged extensions to a considerableheight from the base, as shown in the drawings, in order to afford amplegagingsurfaces. A slot 6 is cut in the base to receive the blade 7 insuch a position that one edge of the blade passes through the apex ofthe V-recess and bisects the angular opening thereof. The blade is adjustably clamped at any desired position in the slot by means of the bolt8, provided with the recess 9, the beveled bottom of which forces theblade against the bottom of its slot as the bolt is drawn endwise by itsnut 10. By loosening that nut and pushing the bolt back slightly theblade is loosened for adjustment.

The standard 11 is fitted to slide freely in its hole in the base 5 andis provided at its lower end with a marking cutter or disk 12. A recessis made in the lowersurface of the base 5 to receive the cutter, inorder that it may be drawn in flush with that surface. The standard iscapable of being clamped at any position in the base by means of the pin13, which passes through the base transversely to the standard, and isso arranged that the tapering bottom of a recess in the side of the pinmay be forced against the side of the standard as the pin is movedendwise. The

ends of the pin are preferably made to projeet beyond the area of thebase, as shown in Fig. 2, so that those ends may be tapped upon thebench or upon any convenient block for the purpose of tightening orloosening the standard. The tool is thus adapted to be used as acarpenters gage.

The sleeve 14 is fitted to slide upon the standard and is split, asshown in Fig. 2. A bolt 15 passes through the sleeve transversely to thestandard 11, and has atransverse hole through its head end in which isfitted the scriber 16, the hole being so located with reference to theshoulder of the bolt as to allow the scriber to bear against the sleeve.Thus the scriber is clamped in the bolt and the sleeve is tightened uponthe standard by tightening the thumb-nut 17.

A hole 18 is located in the base at a distanee from the center of thestandard equal to that of the scriber when in its vertical position, asshown in Fig. 4., wherein-the tool is shown in its capacity asa depthgage, the adjustment for depth being made by slipping the scriber in itsbolt or slipping the bolt upon the standard.

In workshop practice it is often desirable to scribe concentric circlesor arcs of circles upon the face of circular work, such as gearblanksand cams, which have raised hubs or have their centers bored out so asto aiford no pivotal support for dividers or compasses. Figs. 1 and 2represent my improved tool as adapted to perform such work, the scriberbeing adjusted to suit the location of the mark to be made.

The tool is also adapted as a center-gage, as shown in Fig. .3, by theinsertion of the blade 7.

I am aware that one form of surfacegage is now made having an angularrecess roughly cast in its base somewhat similar in appearance to thatshown herein; but that recess is avowedly for the purpose of enablingthe scriber to fold down close against the standard in order to enablethe tool to be packed in its closest compass. As the angular walls ofthis recess in the tool alluded to are only roughly cast, it will notserve the purpose of my present device, the walls of which areaccurately planed or milled out in planes at right angles to the baseand substantially at right angles to each other.

The improved form of the base of this combination-tool, as herein shown,is such as to enable it to receive the several members and to hold themfirmly to afiord generous gagin g-surfaces at the bottom and in theangular recess thereof and at the same time to make the base very lightfor convenience and ease of handling. This excellence is secured bymeans of the flanged construction shown, whereby the greatest lightnessconsistent with rigidity and adaptability to its purposes are secured.

I claim as my invention The herein-described base for a combina' tionsurface-gage and center-square, having upward flanges which form thewalls of a V- shaped recess, provided with a slot parallel with thebottom surface of the base, adapted to receive and locate a blade sothat its working edge shall pass through the internalapeX of the V-wallsand bisect the angular opening thereof, the base being also providedwith an upwardly-projecting hub located at one side of the blade,whereby the standard and the blade may pass by each other, with meanssubstantially as described for clamping the blade and the standardadjustably to their respective places.

J AS. R. TOPPING. \Vitnesses:

W. W. TOPPING, WV. H. HONISS.

